I know they are way too late to host the halloween party or maybe I just did not post it in time? Well, other than that. Pengur did a lot of updates for the halloween party including a lot of changes and of course some quests with some spooky tasks!
When you first visit their play page, you can notice that they did some changes to their startscreen with a lightning effect:
When you click a server, you can see a welcome screen with a halloween party logo with dark clouds: